542 
Proceedings of the Royal Irkh Academy. 
The pectoralis major consisted of two parts, one from the median line 
of the front wall of the thorax, running transversely to the whole 
length of the humerus. The middle fibres are common to the two 
sides, the deeper fibres run transversely. A second perfect!}' separate 
part of the great pectoral springs from the whole length of the sternum 
and is also inserted into the whole length of the humerus. The super- 
ficial is to the deeper part as "5 : '87. 
There was no pectoralis minor nor subclavius. The deltoideus 
olavicularis arises from the inscription in which the fibres of the trape- 
zius clavicularis ended ; some fibres of the latter muscle, however, 
being directly continued into it without any tendinous intersection. The 
insertion is into the middle three-fifths of the humerus. The acromial 
deltoid arises external to the metacromion from the extremity of the 
acromion proper, and is inserted into the upper part of the deltoidal 
crest just behind the clavicular part. The scapular deltoid springs 
from the whole length of the spine of the scapula behind the meta- 
cromion, and is inserted underneath the acromial part. These parts 
are related as follows in size: — Clavicular - 0*18 ; acromial 0*06; 
scapular 0'06. 
The supraspinatus is to the infraspinatus as 0'35 : 0°2. The teres 
minor was absent altogether in the right arm, but represented on the 
left by a slight thread along the inferior margin of the infraspinatus, 
made of fibrous tissue without the slighest trace of muscle. The 
teres major was large, nearly equalling the infraspinatus ; subscapu- 
laris was intersected by five tendinous planes, and had no separate 
subscapula-humeral slip. The serratus magnus arises from the seven 
upper ribs and from the six lower cervical transverse processes, by a 
continuous origin, its insertion is into the hinder part of the meso-and 
post-scapulae. 
Coracobrachialis was absent in the right arm, present as the short 
variety in the left. 
The biceps is gleno-radial and penniform as usual, with its inser- 
tion on a plane lower than that of the brachialis anticus. The bra- 
chialis arises externally from the whole length of the humerus, and 
is inserted into the ulna as usual. They were to each other as 
follows: — Biceps = 0-13: Brachialis = O'll. The long head of the 
triceps arises from the outer half of the axillary border of the scapula, 
and was quite separate for its whole length, the two laternal heads 
were also separable. The dorsi-epitrochleais arises from the upper 
edge of the latissimus dorsi tendon, and from the border of the infra- 
spinous fascia ; it was very large and inserted into, the olecranon, and 
into the inner side of the fascia of the forearm for more than one-half 
its length. There were two equal anconei, externus and internus. In 
the arm, the flexors were to the extensors, as 0*24 : 1*36. The pronator 
radii teres was inserted into the third and fourth-sixths of the radius. 
The flexor carpi radialis was normal, the flexor ulnaris completely 
double, consisting of an olecrano-pisiform, and a condylo-pisiform part, 
which are respectively^O-13 and 0'03 in size; the latter arises in common 
